What
kinds of laboratory tests are available?
Your veterinarian will take into account your pet’s
symptoms, breed, age and sex when recommending laboratory
tests. The following are the most common laboratory tests
in veterinary practice.
Complete
Blood Count (CBC)
A CBC measures the number of red blood cells, white blood
cells and platelets in a sample of blood. The numbers of
each type of cell give your veterinarian information to
help him diagnose anemia, infections and leukemia. If your
pet is undergoing treatment for a condition, a complete
blood count can help your veterinarian monitor how your
pet is responding to the treatment.
Urinalysis
(UA)
Laboratory testing of your pet’s urine will help your
veterinarian detect the presence of specific substances
that normally do not appear in urine, including protein,
sugar, white blood cells or blood. Measuring the dilution
or concentration of urine can also help your veterinarian
diagnose illness. Urinalysis can be helpful in diagnosing
urinary-tract infections, diabetes, dehydration, kidney
problems and other conditions.
Blood-Chemistry
Panel
A blood-chemistry panel measures your pet’s electrolytes,
enzymes and chemical elements of his blood such as calcium
and phosphorous levels. These measurements help your veterinarian
determine how your pet’s organs, such as kidneys,
pancreas and liver, are currently functioning. Blood-chemistry
panels also help your veterinarian accurately diagnose and
treat illness, as well as monitor your pet’s response
to treatment. Your veterinarian may also use the results
of a blood-chemistry panel to determine if further testing
is needed.
Your
veterinarian may recommend a chemistry panel to obtain your
pet’s baseline values, which can be compared to later
tests. Any differences between the baseline values and values
measured at a later time will help your veterinarian diagnose
new problems.
Blood Clotting Function
Activated
Partial Thromboplastin Time (APTT)- Blood coagulation screening
test to check for bleeding disorders. Important for pre-surgery
screening to determine clotting time and a patient's possible
need for blood components or other therapy.
Heartworm Test
Your veterinarian may recommend a blood test to confirm
the presence of heartworms in your pet. Several different
heartworm tests will show the presence of microfilariae
(offspring of adult heartworms) in your pet’s blood.
There are other blood tests that confirm the presence of
adult heartworms by detecting certain substances in the
bloodstream.
Fecal
Examination
Your veterinarian may examine your pet’s feces under
a microscope for clues about many different kinds of diseases,
including difficulties with digestion, internal bleeding
and pancreas disorders. Most importantly, fecal examination
will confirm the presence of intestinal parasites, including
roundworm, hookworm, whipworm, tapeworm and giardia.
Skin
Scraping
Skin scraping is one of the most common tests in veterinary
dermatology. Your veterinarian will take a small scraping
of your pet’s skin and examine it under a microscope
to confirm the presence of certain types of fungi or microscopic
parasites on your pet’s skin.
Fungal
Culture
Your veterinarian may take a few hair samples if he is concerned
about the possibility of a fungal infection on your pet’s
skin. A culture test can be performed on the hair sample
to detect the presence of fungi such as ringworm. Unlike
other laboratory tests, it usually takes one to two weeks
to get a final result from a fungal culture.
Test
of Thyroid Function
A thyroid gland that is not functioning properly may not
be producing hormones that are vital to maintaining normal
growth and metabolism, or it may be producing too much hormone.
Your veterinarian will measure the hormone concentrations
in the thyroid gland to determine if your pet’s thyroid
is functioning properly.
Fine-Needle
Aspirates
If your pet has an unusual lump or bump on his skin, your
veterinarian may take a sample of it using a hollow needle
to withdraw cells and/or fluid from the lump. Your veterinarian
will examine the sample on a slide under a microscope to
help diagnose infections or cancer. Fine-needle aspirates
also provide information about whether a tumor is malignant
or benign, and if additional testing or treatment is needed.
Test
for Feline Immunodeficiency Diseases
Your veterinarian may recommend a test to determine whether
or not your cat has contracted feline immunodeficiency virus
or feline leukemia virus. Your veterinarian will take a
blood sample to perform an enzyme-linked immunosorbent assay
(ELISA) to diagnose these viruses.
Laboratory
testing can help catch many conditions early before they
become serious illnesses, so be sure to ask your veterinarian
about which tests your pet may need during your pet’s
next wellness exam.
Thanks to AAHA for this comprehensive article. We are proud
to be an accredited member. (Go to http://www.healthypet.com/Accreditation/AboutAAHA.aspx
to learn why this is important to your pet).